Direct fired heating device

ABSTRACT

A direct fired heating device consists of a tank for containing the material to be heated and a pair of spaced elongated heat exchangers disposed in said tank with portions extending outwardly of one end of said tank. Each of said heat exchangers includes elongated tubular baffles disposed therein and one of said heat exchangers is placed in communication with a source of combustion the products of which are directed into the tubular baffle therein. The other of the heat exchangers has the tubular baffle therein in communication with the other heat exchanger so that the products of combustion are recirculated in a tortuous path through both heat exchangers and subsequently vented to the atmosphere.

United States atent Miller Sept. 11, 1973 [5 DIRECT FIRED HEATING DEVICE Primary Examiner-Kenneth W. Sprague [75] Inventor: John H. Miller, Youngstown, Ohio AHOmeYT'WebStCr Harpman [73] Assignee: Hy-Way Heat Systems, Inc.,

Youngstown, Ohio [57] ABSTRACT Filed: May 5, 1972 A direct fired heating device consists of a tank for con- [21] APPL No: 250,795 taining the material to be heated and a pair of spaced elongated heat exchangers disposed in said tank with portions extending outwardly of one end of said tank.

[ 122/136 R, 126/343-5 A, 126/360 R Each of said heat exchangers includes elongated tubu- [51] Int. Cl. F2211 7/00 lar baffles disposed therein and one of said heat ex- [58] Field of Search 122/33, 136, I49; changers i placgd i communication with a Source of 126/3435 360 R; 431/1 16 combustion the products of which are directed into the tubular baffle therein. The other of the heat exchangers [56] Relerences Clted has the tubular baffle therein in communication with UNITED STATES PATENTS the other heat exchanger so that the products of com- 2,794,426 6/1957 Lowery 122/136 bustion are recirculated a tortuous P through 3,315,659 4/1967 Schmitzm. 126/3435 both heat exchangers and subsequently vented to the 3,349,754 10/1967 Bock 122/136 X atmosphere. 3,681,566 8/l972 Sellers l26/343.5

4 Claims, 2 Drawing Figures 1 DIRECT FIRED HEATING DEVICE BACKGROUND OF THE INVENTION 1 Field of the Invention This invention relates to direct fired heating devices usable in heating oil, asphalt or any other liquid in the tank of the device.

2 Description of the Prior Art Prior structures of this type have utilized tubes positioned in tanks and the introduction of the products of combustion into said tubes. US. Pat. No. 2,185,594 direct fires a tube in direct contact with the liquid to be heated and the end of the direct fired tube branches into separate tubular conductors. No means is provided for establishing a uniform temperature on the surface of the heat exchanger and avoiding hot spots which would coke oil or asphaltic materials being heated. US. Pat. No. 3,315,659 shows a similar arrangement which would again provide undesirably high temperatures in direct contact with the material being heated.

This invention eliminates high temperatures which would coke or otherwise adversely affect oils or asphaltic materials being heated by the direct fired device as uniform temperatures are maintained over the surfaces of the heat exchangers employed and the gaseous products of combustion are recirculated to achieve a regeneration effect wherein a higher ratio of heat transfer to the material is obtained without adversely affecting the same.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation with parts in cross section and parts broken away illustrating the direct fired heating device as utilized in a tank in which material to be heated is positioned.

FIG. 2 is a vertical section on line 2-2 of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT In its simplest form the direct fired heating device disclosed herein comprises a tank in which material to be heated may be positioned, such materials would include oil, asphalt and similar materials. The tank 10 has a closed end 11 and an apertured end 12 and a pair of elongated heat exchangers 13 and 14 aredisposed within the tank 10, their innermost ends being spaced with respect to the closed end 11 of the tank 10 and their other ends extending through the apertured end 12. The heat exchanger 13 has a closed end 15 and an apertured end 16 which is located lengthwise of the tank 10 and a source of combustion such as an oil burner 17 is in communication with the apertured end and directs its combustion into a directional nozzle 18 which in turn directs the products of combustion into an elongated tubular baffle 19. The tubular baffle 19 is disposed axially of the heat exchanger 13 and its ends are open and spaced with respect to the end 15 of the elongated heat exchanger 13 and with respect to the directional nozzle 18.

By referring to FIG. 2 of the drawings it will be seen that the elongated tubular baffle 19 is supported within the elongated heat exchanger 13 by a plurality of radially extending arms 20.

A pipe 21 establishes communication between the elongated heat exchanger l3 and the elongated heat exchanger 14 and more particularly with a secondary elongated tubular baffle 22 therein one end of which communicates directly with the pipe 21. The secondary tubular baffle 22 is spaced with respect to the elongatedheat exchanger 141 by means of a plurality of radially extending arms 23 and the end thereof in communication with the pipe 21 is otherwise closed with respect to the interior of the elongated heat exchanger 14. The opposite end is open and spaced with respect to an end 24 of the elongated heat exchanger 14. A vent pipe 25 communicates with the elongated heat ex changer 14 exteriorly of the end 12 of the tank 10 and it will'be seen that the one end of the elongated heat exchanger 14 extends through the end 12 of the tank 10 just as one end of the elongated heat exchanger 13 also extends therethrough in order to establish communication with the source of combustion.

It will thus be seen that products of combustion as originated by an oil burner 17 and directed by the directional nozzle 18 into the elongated tubular baffle 19 will flow therethrough as indicated by the arrows. They will emerge from the end inwardly from the end 15 of the elongated heat exchanger 13 and flow in the opposite direction toward the nozzle 18 where some of them will be recirculated by the jetlike effect of the products of combustion being introduced into the elongated tubular baffle 19. Some of the gases will pass through the pipe 21 into the secondary tubular baffle 22 and follow the path indicated by arrows in H6. 1 of the drawings to the vent 25.

By referring now to P10. 2 of the drawings it will be observed that the pair of elongated heat exchangers 13 and 14 are positioned longitudinally of the tank 10 and that their diameter is substantially less than the area of the tank 10 thereabout.

By referring to FIG. 1 of the drawings it will be seen that the inner ends 15 and 24 of the elongated heat exchangers 13 and 14 respectively are arcuate in cross section and that they are spaced with respect to the end 11 of the tank 10.

The construction is such that the products of combustion entering the elongated heat exchanger l3and more particularly the elongated tubular baffle 19 therein will recirculate partially therethrough in a regenerative effect and that the gases that do not so recirculate will pass through the pipe 21 into the secondary elongated tubular baffle 22 in the elongated heat exchanger 14. The construction is such that uniform temperatures are realized on the exteriors of each of the elongated heat exchangers 13 and 14 with no hot spots which would cause undesirable coking or burning of material in contact therewith.

Although but one embodiment of the present invention has been illustrated and described, it will beapparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention.

1 claim:

1. A direct fired heating device for incorporationin a tank in which material is to be heated and consisting of a pair of elongated heat exchangers positioned in said tank in spaced relation to one another, one end of one of said elongated heat exchangers extending outwardly of said tank and means for introducing theproducts of combustion into said outwardly extending end, an elongated tubular baffle disposed in each of said elongated heat exchangers and spaced with respect thereto said elongated tubular baffle in the elongated heat exchanger into which the products of combustion are introduced being open at both ends and arranged to receive said products of combustion, means establishing communication between said elongated heat exchanger into which said products of combustion are delivered and the elongated tubular baffle in the other of said elongated heat exchangers and vent means in communication with said other of said elongated heat exchangers so that the products of combustion introduced into the direct fired heating device may be vented to the atmosphere therethrough.

2. The direct fired heating device set forth in claim 1 and wherein each of the elongated tubular baffles are of diameters at least half that of the elongated heat extherein. 

1. A direct fired heating device for incorporation in a tank in which material is to be heated and consisting of a pair of elongated heat exchangers positioned in said tank in spaced relation to one another, one end of one of said elongated heat exchangers extending outwardly of said tank and means for introducing the products of combustion into said outwardly extending end, an elongated tubular baffle disposed in each of said elongated heat exchangers and spaced with respect thereto said elongated tubular baffle in the elongated heat exchanger into which the products of combustion are introduced being open at both ends and arranged to receive said products of combustion, means establishing communication between said elongated heat exchanger into which said products of combustion are delivered and the Elongated tubular baffle in the other of said elongated heat exchangers and vent means in communication with said other of said elongated heat exchangers so that the products of combustion introduced into the direct fired heating device may be vented to the atmosphere therethrough.
 2. The direct fired heating device set forth in claim 1 and wherein each of the elongated tubular baffles are of diameters at least half that of the elongated heat exchangers in which they are positioned.
 3. The direct fired heating device set forth in claim 1 and wherein each of said elongated tubular baffles are positioned axially in said elongated heat exchangers.
 4. The direct fired heating device set forth in claim 1 and wherein said elongated heat exchangers are positioned in parallel arrangement and the ends thereof opposite with respect to the source of combustion are arcuate in cross section and spaced with respect to the ends of the elongated tubular baffles positioned therein. 